Shadow puppets are read as stories told through outlines rather than substance. Dream tradition links them to illusion, the past and what is seen only indirectly.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.